package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendcode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //2.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //3.保存验证码
        //session.setAttribute("code",code);基于session
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //4.发送验证码
        log.debug("发送短信验证码成功，验证码为：{}",code);

        return Result.ok();
    }


    //登录验证
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //2.校验验证码
        //Object cachecode = session.getAttribute("code");
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(code ==null || !cachecode.toString().equals(code)){
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //3.查询用户,select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();
        //4.不纯在，自动注册新用户
        if(user == null){
            user = createUserWithPhone(phone);
        }
        //5.保存用户信息到redis中
        //5.1生成随机token作为登录凭证
        String token = UUID.randomUUID().toString(true);
        //5.2将用户信息转存到redis中以Hash形式
        UserDTO userDTO = new UserDTO();
        BeanUtils.copyProperties(user, userDTO);
        String tokenkey = LOGIN_USER_KEY + token;
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        stringRedisTemplate.opsForHash().putAll(tokenkey, userMap);
        //设置有效期
        stringRedisTemplate.expire(tokenkey, LOGIN_USER_TTL, TimeUnit.MINUTES);

        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //保存用户到数据库
        save(user);
        return user;
    }
}
